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Calibrating Engine RPM

Subject: Calibrating Engine RPM
From: Dennis Lowe <DennisL@inovatec.co.uk>
Date: Fri, 26 Sep 1997 17:22:10
I believe mains frequency is only accurate over a 24hr period for clocks,
timers etc, in the short term frequency is  modified according to load on
the grid. I seem to remember a figure of +-10% from many years ago.



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